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Sean Nguyen's Biology Crossword Puzzle

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Across
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capable of injecting poison by means of a bite or sting
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the clear part of the egg, which also supplies food and water for the embryo
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the scientific study of birds
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a fibrous protein forming the main structural constituent of hair, feathers, hoofs, claws, horns, etc
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fluid-filled membrane that surrounds the developing embryo
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bird feathers used for flight
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an object on which a bird alights, such as a branch
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a structure or place made or chosen by a bird for laying eggs and sheltering its young
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the process of shedding old feathers, skin, or shell, to make way for new growth
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active at night
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the main food supply for the embryo in the egg
Down
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an unborn or unhatched offspring in the process of development
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bird feathers used for insulation
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The tusk or tooth of an animal, by which the prey is seized, injected with poison, or held and torn
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the jaws of a bird
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seasonal movement of animals from one region to another
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process of keeping eggs warm outside the body
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the process of a young bird, fish, or reptile emerging from its egg
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a short, high-pitched sound, such as the one a small bird or insect makes
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a place where birds regularly settle or congregate to rest at night